I made a typo, sorry. If I rearrange it to read 9x^+18x+9y^-12y=131 I know I need to factor out a number before completing the square on both sides, but if I factor out a 3 it's got me confused. Example: 4x^+12x+4y^+24y-99=0 move the 99 and factor out a 4, then complete the square both sides 4(x^+3x+9/4)+4(y^+6y+9)=99+4(9/4)+4(9) 4(x+3/2)^+4(y+3)^=144 divide both sides by 4 (x-3/2)^+(y+3)^=36 (-3/2,-3) radius 6 The first example just isn't working out for me.

You've got 9's in front of both squared terms. I don't know where you're getting a 3 from...? Instead, try factoring out the number in front of both squared terms, just like you have for every other exercise of this type.